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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9814b7312d6d072fdeb0fd4b0b8c14e9ed1d28e19397e12f6366ec041276119' 
  AND token = '/+MnOSJDOmYn+6vp4Y0dVYeUJziwHv6doY7en5H3FEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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