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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0591ccb5665122398eebede16ede720c76417e2a93eba92eca52aa6db242c45e' 
  AND token = 'RFEwLF6crds4jfWaCcdkzd/o4z3gCpzrzKwhOQy4VNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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