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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e94e4990658a9f1649eb104657308291f105eca88061a4ace83cd79b1c4ee895' 
  AND token = '7kaPWAowDAtL5xR8esJPijMpyEik/ze/2PETrO/JyZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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