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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a7bc759c51e9abd548adffd22f0538b33f6f271b37cc140e4d515bddd8edeba' 
  AND token = 'OJgLmfPD+O32QUednd6Bfc+MrGSukD7OXiyaEQ95bxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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