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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ee979fa8e45926a0b33b4c64983a5cf6cefb1451654af7fe4989cad3a7511ee' 
  AND token = 'uZEZ48sNz6a08BVzcqv04ncjztWJywwVjNJOci/gYzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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