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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cb444050ccc19369170baa75214d94aa6172fb09e7fc0e3faaef63ada29cf63' 
  AND token = 'wiZFPiq77gMKWbpts4SE1x+kUVxt+ibxhdHMgyu+9qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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