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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bacba15ae3e895649e617fb30139c0daa7f144ebc170a87080282da06e14cf4b' 
  AND token = '0Xh40ywTv4JNHgVy+1qFqp1JPwO4kMWT5JsnBShNRwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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