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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38fe714ba3d501aa0502342273718c1f81883dd6adfd10e0eddd50ec94f291b4' 
  AND token = '55hKYdMAGZPRZR8ZP0Ld5h0EB5kqKr+t0lDd1XozwqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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