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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be7c810135a950f4d945bae795a1e6ae1248bb9799925309e6a11c97a1fb4ee' 
  AND token = 'vAWglmAABJbmGtLKq4SKql65c62DCzpk24iktQ/8IOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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