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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a67eac9d82317cd9469c87d95c488a3d0f4dfe5cc3174e51e2cda7d70871afc' 
  AND token = '2wKncsuF+qoh7TLq34t04mHPbcaiiuNPKud3if7JN/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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