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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6bc0630a050bfed89505fe3c3e6bcfdaf59a1f78a7514567544665f92d09451' 
  AND token = 'mvugj3nVuSm3aLDGqJQL+B5JWGo56fakwaHxfFlyoCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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