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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88b3faa88bc0a0531f6fd27b285c07921254f76c7b803437ce486e652a3e8ad8' 
  AND token = 'xAojCreykrOAk80xE84KUogG1Z/aBIZjfc+cC1JEIx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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