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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4bf90dd24f87e020a3117671d5f0c86d54d0be90ed547401fcaec57c45ead19' 
  AND token = 'dqMurPOD2D9H4a520wgcZ9Ils8mhL9sIEMvHnkeDS+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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