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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b12b961a56203c95d97f6385052c190fa8f905c9592188369a3606a38ef72f94' 
  AND token = 'jjF04JjEAD80fMphoIUQ5EtQd54X6ym6B45m861121U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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