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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d2ac59ea0aa8dc0cc3cb17378a862613f1e41bc2f8f242a1851e327520d796' 
  AND token = 'jVzm781Kr34YBpk4tuPH+Frfv5y7cwzlUhfwqe6uPcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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