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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8788b26403ee3f859c2a946fee77c231e40614a83d1afb7ecb1a16446d17e142' 
  AND token = 'KSppXIL9taO7iWjwbmhUlF7zNC/eGJusNs4SThlpF+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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