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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5167782fbf754ea9cd220fac45b55bf8d197ae91b8c724469785cee24ace7aea' 
  AND token = 'Tnvglz1Phv2/7RRFLrtnOPY2vcf8NeCYDMXIXf15He0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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