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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a7eb79f29d065569dfacadabccef6f0d7e816fcf26fc893c152ec6b74f2376' 
  AND token = 'kbktgc9nhOqhc8dJQv6NBvIAMHNieuj672Z+YgImftA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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