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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62b0db77fdea0aa3a3ae0e9454b644d6471bcd659970d4f9a40cfa37bc627d0' 
  AND token = 'slSXspxhhyAz+HLP7XVMLeObnjTv+vmi6wxHparHX/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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