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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d93a0f03d3a97405b1e5418d757ea840bbe524860443df80388a9a3ae1404d' 
  AND token = 'AbWyXOSEI5Zvo7qfyJkJLZmpiM2Hk6fHmaYM4UP0B94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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