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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e410c27bd6e19a9849a54da49222c79b344cd33e7ce6b096041dfb6fb1fe051c' 
  AND token = 'zGX1VBuitCs2ogzzQNs/OxNMSP7vKNN3uaOnWrC77Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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