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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46859bb2a3e9ba626957f076b247d74963d605e122163d4b54ef4820817e0b9e' 
  AND token = 'KTEoeMvVbdZ9XXpiQnGhL+t3TJRZSIG1bFHw8O05RnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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