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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed37d47df3cf92e60fc86b9f49b4a07f58c1ef5ff9b85f25060009ff15ac6763' 
  AND token = '3CYyPMPt81WF0eog5mgDsQpPXh51g3L6xANqNrIngyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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