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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '432770a2f265c653514bf4d1c662fd3d2cde75c74dab72c6191a5226a5fb6e6b' 
  AND token = '0Dhp8G/0ZwD3m2/xRgS0updbBJr0InD0Ir7pfPdYfMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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