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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ee585796378087a83d56c6736df8cf67dccd5d45df062c13589f239ab934b5' 
  AND token = '+Wt2i4LfzL66XTp27HVPRul2RHxO537FB79ywWGnQGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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