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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f836f767f64b2f33b4ed21809d7486b963d01cbbaf681b2c3f66c43608eb72d5' 
  AND token = 'Lzozek52yWmXNX/R1TBrBdSfXeiHZuPDGrqeOCJhq5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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