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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90388df045514a9c1cddb19474ad8eec8347ce1a3b9bb816aff3235e06e6660f' 
  AND token = '6Lnc5M4CBAbW2V1r14y0y9/Qc8SUsjqLJoYPLnmd8wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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