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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee1a365d62d3561c7ca0925004fd623d95bb07d617acb9e75ca0083a8b5aa08c' 
  AND token = 'KqfpFFh0DD2acro0CTGfFQPKwBE6mbSEqOmsk79U+Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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