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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f47d7dc853ae3510ad1e43cb038d1fac4fbebff41a02df3ac1b656a497409eff' 
  AND token = 'JTMF4yuCnqduUEWJswYY2Qy4odYUcQPe5daE1rJjiEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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