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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69c70643936317afe5f797c0be114d62db622e4fc34b0431543ce479986c8d1e' 
  AND token = 'AOOBwjpQGLU4BN5OGlPak4T31Yxj/OgIHLL0WFSgUwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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