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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e135eceebd7150ac4cc88f173bc5d920fa869580e9aa4a0902bc0d312d7f8bec' 
  AND token = 'GlV6rOAqg7bEqKmlqkNaskrOcwhm7xUCXbS2B32s450=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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