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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec6dbbfcc0e2d3063041dfc34f700c8464763251747b0d69ffdbf45be602b8a9' 
  AND token = 'q94q0CKZh4wkShssvePY+S60+KSU3VGYulB4+0y94xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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