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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fadd03805603a87fee52b26e3c8fd32b0c5c2bd79aeade6a86f5f02bf6a0b8c' 
  AND token = '810V/pSSwHhnk6vV2c4M+9bPxmQG/zITIcBs3EabYn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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