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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3cd0e58e17c6fb8db3ff6d62c992a12482c2613f8c82ad4d9bc570f6f8f4119' 
  AND token = 'Bnb/lEelrkMH0l3hhmy7VMlaMrJH7RXDiB0O1nqLJY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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