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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03309d66bbc6a9ac7b0b916a0e67789d1b89ce5588c43648968073d89689cc36' 
  AND token = 'o19h93s0cQzrDKUt07jvA4H1GnMcnTODBxxuPKbGqc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}